GENUS 17. 



CHICORY FAMILY 



3. Lactuca ludoviciana (Xutt.) DC. West- 

 ern Lettuce. Fig. 4070. 



Sonchus ludovicianus Nutt. Gen. 2: 125. 1818. 

 Lactuca ludoviciana DC. Prodr. 7: 141. ^838. 



Biennial, glabrous throughout, leafy up to inflor- 

 escence, paniculately branched, 2t-$ high. Leaves 

 oblong to ovate-oblong, acute or acutish, 2'-4' long, 

 auriculate-clasping, spinulose-denticulate, sinuate- 

 lobed, or pinnatifid with spinulose segments ; heads 

 3"-5" broad, numerous in an open panicle, their 

 peduncles bracteolate ; involucre cylindric or ovoid- 

 cylindric, glabrous, S"-g" high, its bracts succes- 

 sively shorter and broader, the lower ones ovate ; 

 rays yellow ; achenes oval to obovate, flat, about 

 the length of their filiform beak; pappus white. 



Plains and banks, Iowa, Minnesota and South Da- 

 kota to Kansas and Texas. July-Sept. 



4. Lactuca hirsuta Muhl. Hairy or Red 

 Wood-Lettuce. Fig. 4071. 



Lactuca hirsuta Muhl. Cat. 69. 1813. 

 Lactuca sanguinea Bigel. Fl. Bost. Ed. 2, 287. 1824. 

 Lactuca elongata var. sanguinea T. & G. Fl. N. A. 2 : 

 496. 1843. 



Stem i-6 high, naked and paniculately branch- 

 ed above, usually hirsute, at least below. Leaves, 

 or most of them, sinuate-pinnatifid, pubescent on 

 both sides, or on the midrib beneath, those of the 

 stem mostly sessile or auriculate-clasping, 3'-7" 

 long, the uppermost sometimes lanceolate and 

 entire, the basal petioled ; heads numerous, 2"-3" 

 broad ; involucre glabrous, 5"-p" high ; outer bracts 

 shorter than the inner; rays reddish-yellow or 

 paler ; achenes oblong-oval, flat, about the length 

 of the beak ; pappus white. 



In dry soil, Quebec to Ontario, Minnesota, Ala- 

 bama and Texas. Stem, peduncles and involucre 

 often red or purple. July-Sept. 



5. Lactuca Steelei Britton. Steele's .Wild 

 Lettuce. Fig. 4072. 



L. Steelei Britton, Man. 



1901. 



Stem and branches hirsute. Leaves obovate to oval, 

 the larger about 8' long and 4' wide, sessile, irregu- 

 larly dentate, not lobed, hispid on the veins beneath, 

 short-acuminate ; involucre about 6" high ; rays not 

 seen; achenes oval, 3-ribbed, about \\" long, the fili- 

 form beak slightly shorter; pappus bright white. 



Near Washington, D. C., and, apparently, in Delaware. 

 July-Aug. 



